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The mysterious death of an eccentric millionaire brings together an unlikely assortment of heirs who must uncover the circumstances of his death before they can claim their inheritancesubjects: Fiction, Humorous Fiction, Mystery Fiction, Detective Stories, Apartment Houses, Newbery Medal Winner 1979.

After he sees some unusual late-night deliveries, Martin's active imagination has him and his friends convinced that the man who has recently moved into the attic apartment should be watched.

"When the Alden siblings visit their grandfather's friend in an apartment building, they begin to wonder about the many mysterious events that keep happening on the thirteenth floor of that building" OCLC.

"Twelve-year-old Minerva Keen forms a detective club to uncover who is poisoning residents of her storied Chicago apartment building, knowing that any one of her neighbors could be the poisoner--or the next victim"--Provided by publisher.